[ABLD-174] Compose buildifier from upstream & multitool (#41336)

### Motivation
Currently, `buildifier` targets don't work out of the box on Windows -
credits to @ofek for reporting.

Sadly, it turns out that two separate attempts have already been made to
remedy this:
1. In the upstream `bazelbuild/buildtools` (`go` source, but only
`workspace`-suitable):
bazelbuild/buildtools#1230 (merged)
2. `keith/buildifier-prebuilt` (`bzlmod`-suitable, and providing
-slightly outdated- `go` binaries published by `bazelbuild/buildtools`):
keith/buildifier-prebuilt#89 (well tested, but
pending CI feedback... for months!)

### What does this PR do?
Inspired by some of @aiuto's
[tips](https://datadoghq.atlassian.net/browse/ABLD-174?focusedCommentId=2644283):
> [1.b.] instead of pointing to the toolchain type defined in
buildifier_prebuilt, point to buildifier via multitools.
> [2.a.] revert prebuilt_buildtools.json to
5fd6373

The present change proposes the "least intrusive" change so that:
- we don't need to start a third effort (own rules, `.bash` and `.bat`
scripts),
- we benefit from the validated and merged upstream behavior,
- we don't depend on the goodwill of `keith/buildifier-prebuilt` to
publish the version `8.2.1` of the binaries (nor subsequent versions),
- we don't have to manage a complex patch, but instead simply inhibit
the upstream lines that we do not need, given `buildifier`
implementations are provided by `multitool` (again).

In short, this change combines the best of both worlds through a simple
indirection made possible by the configurability of upstream rules
which, unlike `keith/buildifier-prebuilt`, allow us to define which
implementation of `buildifier` to use.

### Describe how you validated your changes
I used another branch to verify this works under Windows as well:
https://github.com/DataDog/datadog-agent/blob/026042234ee811fd1641a2417893c08008860186/.gitlab/bazel/build-deps.yaml#L39

Author: rdesgroppes

MODULE.bazel

@@ -11,7 +11,16 @@ bazel_dep(name = "rules_pkg", version = "1.1.0")
 ## Prebuilt binaries   ##
 #########################
 
-bazel_dep(name = "buildifier_prebuilt", version = "8.2.0.2", dev_dependency = True)
+http_archive = use_repo_rule("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "com_github_bazelbuild_buildtools",
+    patch_strip = 1,
+    patches = ["//bazel/patches:buildifier.patch"],
+    sha256 = "53119397bbce1cd7e4c590e117dcda343c2086199de62932106c80733526c261",
+    strip_prefix = "buildtools-8.2.1",
+    urls = ["https://github.com/bazelbuild/buildtools/archive/refs/tags/v8.2.1.tar.gz"],
+)
 
 bazel_dep(name = "rules_multitool", version = "1.9.0")
 

MODULE.bazel.lock

@@ -1,4 +1,4 @@
-load("@buildifier_prebuilt//:rules.bzl", "buildifier", "buildifier_test")
+load("@com_github_bazelbuild_buildtools//buildifier:def.bzl", "buildifier", "buildifier_test")
 
 exclude_patterns = [
     "./.bazelbsp/**",
@@ -7,6 +7,7 @@ exclude_patterns = [
 
 buildifier(
     name = "buildifier",
+    buildifier = "@multitool//tools/buildifier",
     exclude_patterns = exclude_patterns,
     lint_mode = "fix",
     mode = "fix",
@@ -19,6 +20,7 @@ buildifier(
 # - requires additional arguments: `no_sandbox` and `workspace`
 buildifier_test(
     name = "test",
+    buildifier = "@multitool//tools/buildifier",
     exclude_patterns = exclude_patterns,
     lint_mode = "warn",
     lint_warnings = ["-module-docstring"],

bazel/buildifier/BUILD.bazel

@@ -0,0 +1,17 @@
+diff --git a/buildifier/BUILD.bazel b/buildifier/BUILD.bazel
+index 1f1cd67..2f2a5b1 100644
+--- a/buildifier/BUILD.bazel
++++ b/buildifier/BUILD.bazel
+@@ -1,3 +1,4 @@
++INHIBITED_IN_FAVOR_OF_PREBUILT = """
+ load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+ load("@rules_shell//shell:sh_test.bzl", "sh_test")
+ 
+@@ -108,6 +109,7 @@ go_library(
+         "//wspace",
+     ],
+ )
++"""
+ 
+ exports_files(
+     [

bazel/patches/buildifier.patch

@@ -1,4 +1,59 @@
 {
+  "buildifier": {
+    "version": "v8.2.1",
+    "binaries": [
+      {
+        "kind": "file",
+        "url": "https://github.com/bazelbuild/buildtools/releases/download/v8.2.1/buildifier-darwin-amd64",
+        "sha256": "9f8cffceb82f4e6722a32a021cbc9a5344b386b77b9f79ee095c61d087aaea06",
+        "os": "macos",
+        "cpu": "x86_64",
+        "size": 7776816,
+        "published_at": "2025-06-10T13:25:35Z",
+        "asset_url": "https://api.github.com/repos/bazelbuild/buildtools/releases/assets/262636654"
+      },
+      {
+        "kind": "file",
+        "url": "https://github.com/bazelbuild/buildtools/releases/download/v8.2.1/buildifier-darwin-arm64",
+        "sha256": "cfab310ae22379e69a3b1810b433c4cd2fc2c8f4a324586dfe4cc199943b8d5a",
+        "os": "macos",
+        "cpu": "arm64",
+        "size": 7717890,
+        "published_at": "2025-06-10T13:25:35Z",
+        "asset_url": "https://api.github.com/repos/bazelbuild/buildtools/releases/assets/262636658"
+      },
+      {
+        "kind": "file",
+        "url": "https://github.com/bazelbuild/buildtools/releases/download/v8.2.1/buildifier-linux-amd64",
+        "sha256": "6ceb7b0ab7cf66fceccc56a027d21d9cc557a7f34af37d2101edb56b92fcfa1a",
+        "os": "linux",
+        "cpu": "x86_64",
+        "size": 7882884,
+        "published_at": "2025-06-10T13:25:35Z",
+        "asset_url": "https://api.github.com/repos/bazelbuild/buildtools/releases/assets/262636637"
+      },
+      {
+        "kind": "file",
+        "url": "https://github.com/bazelbuild/buildtools/releases/download/v8.2.1/buildifier-linux-arm64",
+        "sha256": "3baa1cf7eb41d51f462fdd1fff3a6a4d81d757275d05b2dd5f48671284e9a1a5",
+        "os": "linux",
+        "cpu": "arm64",
+        "size": 7755744,
+        "published_at": "2025-06-10T13:25:35Z",
+        "asset_url": "https://api.github.com/repos/bazelbuild/buildtools/releases/assets/262636641"
+      },
+      {
+        "kind": "file",
+        "url": "https://github.com/bazelbuild/buildtools/releases/download/v8.2.1/buildifier-windows-amd64.exe",
+        "sha256": "802104da0bcda0424a397ac5be0004c372665a70289a6d5146e652ee497c0dc6",
+        "os": "windows",
+        "cpu": "x86_64",
+        "size": 8020480,
+        "published_at": "2025-06-10T13:25:35Z",
+        "asset_url": "https://api.github.com/repos/bazelbuild/buildtools/releases/assets/262636662"
+      }
+    ]
+  },
   "buildozer": {
     "version": "v8.2.1",
     "binaries": [